ZIP Code 59843

59843 is one of Montana's ZIP codes, delivering to addresses in Helmville, Powell County.

City: Helmville
County: Powell County
State: Montana
Prefix: 598xx

Where this code sits

59843 is part of the 598xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Helmville.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 59843 delivers to without sharing its boundary.

406 Area code 406

ZIP codes nearest 59843

The ZIP codes whose reference points sit closest to 59843.
ZIP code	Distance	Delivers to
ZIP code 59854	14 mi	Ovando, MT
ZIP code 59639	16 mi	Lincoln, MT
ZIP code 59733	17 mi	Gold Creek, MT
ZIP code 59731	18 mi	Garrison, MT
ZIP code 59832	18 mi	Drummond, MT
ZIP code 59837	21 mi	Hall, MT
ZIP code 59713	23 mi	Avon, MT
ZIP code 59640	31 mi	Marysville, MT

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 59843, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 59843. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.